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| Type: | Resource | |
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| Created: | Feb 08, 2023 at 9:14 p.m. | |
| Last updated: | Feb 08, 2023 at 9:15 p.m. | |
| Citation: | See how to cite this resource |
| Sharing Status: | Public |
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Abstract
A steady state groundwater flow model was calibrated to simulate the complex groundwater flow pattern in some crystalline aquifer systems in north-central Ghana. The objective was to develop the general geometry of the groundwater system and also estimate spatial variations in the hydraulic conductivity field as part of efforts to thoroughly investigate the general hydrogeology and groundwater conditions of aquifers in the area. The calibrated model was used in a limited fashion to simulate some scenarios of groundwater development in the terrain. The results suggest the dominance of local groundwater flow systems resulting from local variabilities in the hydraulic conductivity field and the topography. Estimated horizontal hydraulic conductivities range between 1.04 m/d and 15.25 m/d, although most of the areas consist of hydraulic conductivities in the range of 1.04 m/d and 5.5 m/d. Groundwater flow is apparently controlled by discrete entities with limited spatial interconnectivities. Recharge rates estimated at calibration range between 4.3% and 13% of the annual rainfall in the terrain. The analysis suggests that under the current recharge rates, the system can sustain increasing groundwater abstraction rates by up to 50% with minimal drawdown in the hydraulic head for the entire terrain. However, with decreasing groundwater recharge as would be expected in the wake of climate change/variability in the area, increased groundwater abstraction by up to 50% can lead to drastic drawdowns by more than 25% if recharge reduces by up to 50% of the current levels. This study strongly recommend the protection of some of the local groundwater recharge areas identified in this study and the promotion of local recharge through the development of dugouts and other conduits to encourage recharge. (C) 2015 Elsevier Ltd. All rights reserved.
Subject Keywords
Coverage
Spatial
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Additional Metadata
| Name | Value |
|---|---|
| DOI | 10.1016/j.jafrearsci.2014.12.011 |
| Depth | |
| Scale | 101 - 1 000 km² |
| Layers | 1 |
| Purpose | Groundwater resources |
| GroMoPo_ID | 438 |
| IsVerified | True |
| Model Code | MODFLOW |
| Model Link | https://doi.org/10.1016/j.jafrearsci.2014.12.011 |
| Model Time | SS |
| Model Year | 2015 |
| Model Authors | Yidana, SM; Essel, SK; Addai, MO; Fynn, OF |
| Model Country | Ghana |
| Data Available | Report/paper only |
| Developer Email | smyidana@ug.edu.gh |
| Dominant Geology | Crystalline |
| Developer Country | Ghana |
| Publication Title | A preliminary analysis of the hydrogeological conditions and groundwater flow in some parts of a crystalline aquifer system: Afigya Sekyere South District, Ghana |
| Original Developer | No |
| Additional Information | |
| Integration or Coupling | None of the above |
| Evaluation or Calibration | Static water levels |
| Geologic Data Availability |
How to Cite
This resource is shared under the Creative Commons Attribution CC BY.
http://creativecommons.org/licenses/by/4.0/
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